(19)

(11)

EP 0 610 339 A1

(12)

(43) Date of publication: 17.08.1994 Bulletin 1994/33 (21) Application number: 92922547.0 (22) Date of filing: 14.10.1992

(51) International Patent Classification (IPC):  E03B 7/ 04( . ) E03C 1/ 122( . ) (86) International application number: PCT/US1992/008761 (87) International publication number: WO 1993/008340 (29.04.1993 Gazette 1993/11)

(84) Designated Contracting States: AT BE CH DE DK FR GB IE IT LI NL SE (30) Priority: 15.10.1991 US 19910775341 (71) Applicant: THOMPSON, Gary E. Steamboat Springs, CO 80477 (US)	(72) Inventor: THOMPSON, Gary E. Steamboat Springs, CO 80477 (US) (74) Representative: Hackett, Sean James  MARKS & CLERK, 57-60 Lincoln's Inn Fields London WC2A 3LS London WC2A 3LS (GB)